C#检查网络是否可以连接互联网

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mb5ff2f31984205 2017-02-13 17:28:00

添加引用：

using System.Runtime.InteropServices;

using System.Net.NetworkInformation;

[DllImport("wininet.dll")]
        private extern static bool InternetGetConnectedState(int Description, int ReservedValue);

        #region 方法一

        /// <summary>
        /// 用于检查网络是否可以连接互联网,true表示连接成功,false表示连接失败
        /// </summary>
        /// <returns></returns>
        public static bool IsConnectInternet()
        {
            int Description = 0;
            return InternetGetConnectedState(Description, 0);
        }

        #endregion 方法一

        #region 方法二

        /// <summary>
        /// 用于检查IP地址或域名是否可以使用TCP/IP协议访问(使用Ping命令),true表示Ping成功,false表示Ping失败
        /// </summary>
        /// <param name="strIpOrDName">输入参数,表示IP地址或域名</param>
        /// <returns></returns>
        public static bool PingIpOrDomainName(string strIpOrDName)
        {
            try
            {
                Ping objPingSender = new Ping();
                PingOptions objPinOptions = new PingOptions();
                objPinOptions.DontFragment = true;
                string data = "";
                byte[] buffer = Encoding.UTF8.GetBytes(data);
                int intTimeout = 120;
                PingReply objPinReply = objPingSender.Send(strIpOrDName, intTimeout, buffer, objPinOptions);
                string strInfo = objPinReply.Status.ToString();
                if (strInfo == "Success")
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception)
            {
                return false;
            }
        }

        #endregion 方法二